Eventually, I got to where my day job was information developer. That's a fancy term for technical writer. I wrote books about new hardware and software products in a development laboratory where they were designed, tested, and then either mass produced or killed as not viable, comercially.

The books weren't produced or killed. The products they told how to use were produced or killed.

Software products were application programs that ran on small, desktop computers, or operating systems, or instructional languages.

I wrote my books with, or in, a word processing program, and then the books were edited with a text editor, which added features like different typefaces, ordered headings, page numbers, or the insertion of pictures, as line art or digital photographs, a glossary and index, a table of contents.

The text editor did this automatically. You'd key in tags before and after an element you wanted to do something to. One tag would turn the feature on and a corresponding tag would turn the feature off.

This was done in a mark-up language. HTML is a markup language. Hypertext mark-up language.

It's like a copy editor marking up a text with proofreader's symbols for the typesetter. Styling the manuscript, that's called.

I did it back when it was done by hand, and I do it now, at my computer at home, as I write.